extern void init_signals P_ ((void));
-#if defined (HAVE_GTK_AND_PTHREAD) || (defined (HAVE_CARBON) && MAC_OS_X_VERSION_MAX_ALLOWED >= 1020)
+#if defined (HAVE_GTK_AND_PTHREAD)
#include <pthread.h>
/* If defined, asynchronous signals delivered to a non-main thread are
forwarded to the main thread. */